@charset "utf-8";
.mid {
    height: 180vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
}

.headimg {
    top: 0px;
    height: 250px;
    width: 100%;
    background-size: 1540px;
    background-repeat: no-repeat;
    background-position-y: -190px;
    background-position-x: -150px;
    overflow: hidden;
    border-bottom: 5px solid rgb(19, 66, 122);
    animation: headload 0.7s linear;
}

.headimg h1 {
    color: rgb(92, 136, 177);
    font-size: 5em;
    text-align: center;
    line-height: 200px;
}

.mid .ab {
    width: 800px;
    height: 300px;
    box-shadow: 0 0 15px rgb(83, 103, 110);
    background: rgba(71, 142, 175, 0.2);
    border-radius: 15px;
    backdrop-filter: blur(5px);
    display: flex;
    overflow: hidden;
    margin-top: 40px;
}

.ab p {
    word-wrap: break-word;
    color: rgb(1, 1, 1);
    line-height: 24px;
}

.ab .txt {
    width: 400px;
    margin: 0 50px 0 50px;
}

.ab h2 {
    text-align: center;
    color: rgb(4, 4, 4);
}

.ab .img {
    width: 300px;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: grayscale(0.3);
    opacity: 0.8;
    transition: all 0.5s ease 0s;
}

.ab .img:hover {
    transform: scale(1.1);
}

.ab .imghid {
    overflow: hidden;
}

.a1 {
    margin-left: 40%;
    animation: a1load 2.5s linear;
    transition: 0.5s 1s;
}

.a2 {
    margin-left: 10%;
    animation: a2load 3.6s linear;
    transition: 0.5s;
}

.a3 {
    margin-left: 40%;
    animation: a3load 4.8s linear;
    transition: 0.5s;
}

.a3 h2 {
    margin-top: 100px;
    line-height: 50px;
}

@keyframes a1load {
    0% {
        opacity: 0;
    }
    70% {
        opacity: 0;
        margin-top: 100px;
    }
    100% {
        opacity: 1;
        margin-top: 40px;
    }
}

@keyframes a2load {
    0% {
        opacity: 0;
    }
    80% {
        opacity: 0;
        margin-top: 100px;
    }
    100% {
        opacity: 1;
    }
}

@keyframes a3load {
    0% {
        opacity: 0;
    }
    90% {
        opacity: 0;
        margin-top: 100px;
    }
    100% {
        opacity: 1;
    }
}

@keyframes headload {
    0% {
        height: 0px;
    }
    100% {
        height: 240px;
    }
}